Means for lubrication of pintle and hinge sections of pruning shears



May 3, 1932. G. F. HICKOK MEANS FOR LUBRICATION OF PINTLE AND HINGE SECTIONS OF PRUNING SHEARS Filed April 21', 1950 FIE-I:

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INVENTOR. 6 EOPGE F. HIEKOK.

A TTORNEY.

Patented May 3, 1932 UNITED STATES PATENT I #OFFICE 1 GEORGE r. HIGKOK, or BURLINaAirEi CALIFORNIA t I, p I A I MEANS non LUBRICATION or PINTLE AND HINGns ic rOn'soF Jeannine snnans 1 Application filed April 21, 1930. Serial No. 445,908.

The present invention relates to means for blade section, showing the opening, there'- the lubrication of pintle and hinge sections through for the accommodation of the pintle. of shears, and more particularly to those and the oil ducts, "or channelsfradiatin'g parts of pruning hearg therefrom for CllStIlblltlOIl. l i U I 5 As is very well known, the present prac- Referring more particularly'to the draw-{55 tice in lubricating pintle and hinge sections ings, the numeral'3 refers, ina general way, of pruning shears is to dip the entire blades to a pair of pruning shears, of which 4 and 8 including the hinged sections in a vessel of are the blades, the one being prop'erly'the oil allowing these to remain immersed thereblade andthe otherthe hook, the blade being 10 in for such time as may be required to effect provided with a bevelled section 5, body ex-- acomplete oiling, this requiring no little time tensions 6 and Qjadapted to be secured to i and attendant annoyance. woodenhandles 7 and 10, shownon the draw- The present invention has for its object ingsas partly broken away, and a means for the provision of a lubricant stored in a holhingedly uniting the blades, comprising reglow pintle containing therewithin an abistering blade-holes, one of which is threaded l sorbent adapted for saturation with the luband adapted to accommodate the threaded ricant and provided with a port, or opening, end of the pintle, said pintle being provided for the exudation therethrough of the lubriwith an hexagonal head 16 as an aid in screwcant to the pintles exterior surface and ing it into the said blade-opening, and a 20 thence carried to the surrounding frictional lockingnut 14 adapted 'to beset-up on the 70 engaging surfaces of the blades through free threaded end of the'pintle against the, ducts, or channels, carried radially and susurface of the blade, or hook, 8, the-pintle perficially by one or the other, or both, of being further provided with a bore 19 exthe frictionally engaged blade surfaces. tending longitudinally from its hexagonal Though intended primarily for the lubri head to approximately half its length, its 75 cation of the hinged sections of pruning purpose to be made apparent later. shears, it is obvious that the same lubricating The oiling feature 21, as indicated in Figsystem may be applied to any and all shears ure 3, comprises a hollow cylindrical memdepending upon the crossing of their blades ber 12 mounted in the bore 19, provided with for their shearing action, upon applying coma valve-seat 18. and an orifice 18 extending S0 pression. V through both its wall and the contiguous In the accompanying single sheet of drawwall of the pintle bore. Surroundin the ings, forming a part of this specification, regionof said orifice, there is placed a%ayer and in which similar reference characters ie of oil-absorbing material 23 and resting upon fer to like parts, throughout: this a spiral spring 17 bearing a hemispheri- 35 Figure 1 is a plan view of a pair of pruning cal valve 15 adapted through the urge of the shears showinga shock-absorber in place and spring 17 to remain seated upon the valve with the handles partly broken away. 1 seat 13 carried by the upper end of the cy- Figure 2 is an end elevation of the blades, lindrical member 12. To facilitate the 'oil 40 with the hinged portion sectioned for the bet distribution to the exterior surface of the 90 ter illustration of the pintle and its hollowed pintle and to the contacting surfaces of the section bearing the oiler. blades approximate thereto, the inner surface Figure 3 is a longitudinal sectional view of the blade 4is provided with a plurality of the pintle, including its bore extending of oil channels radiating outwardly from the partly therethrough and its contained oiling blade opening 20.

member. Considering the space surrounding the Figure 4 is a plan view of the head borne spring 17 as the oil reservoir, and that it is by one extremity of the pintle and as an indesired to replenish the oil supply, an oiltegral part thereof. can spout is applied to the valve 15 to force It 7 Figure 5 is a plan view of the interior of a down and the oil forced into the reservo1r 0 until replenished, when, upon removal of pressure against it immediately seats, for

- the retention of the oil and the exclusion of dirt, and with lubrication of pintle and adj acent parts taking place from the saturated material 23 through the orifice 18 and the distributing channels 22.

Having thus described my invention, I claim, and desire to secure by Letters Patent of the United States, the following:

1. In a pruning device of the character described, pruning members having registeringlopenings near the-bases of the blades thereof, a hollow pintle positioned in said openings having an orifice in the wall thereof and serving as a pivotal connection for said blades, the frictional surface about the opening of one of said blades bearing a plurality of channels for the conveyance of a lubricant, an absorbent substance within the hollow pintle for the retention of said lubricant, saidpintle being provided with a filling opening leading to said bore.

2. A pruning device comprising a pair of blades having frictional engaging faces, each 'of said blades having an opening therethrough and terminating in its frictionface, a pintle member extending through said openings, one of said blades having a plurallty of grooves on its friction face radiating o'utwardly from the opening therein, said pintle having a bore therein and an orifice leading from said bore through the wall of the pintle and in the plane of the grooves in the blade,

and a lubricant in said bore.

In testimony whereof I hereunto afiix my signature. I

GEORGE E. HIGKOK. 

